ProjectPPC/PPC/MainWindow/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace PPC
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = new MainWindowViewModel();
            Password.PasswordChanged += Password_PasswordChanged;
        }

        private void Password_PasswordChanged(object sender, RoutedEventArgs e)
        {
            if(this.DataContext != null)
            {
                ((MainWindowViewModel)this.DataContext).password = ((PasswordBox)sender).Password;
            }
        }

        private void Hyperlink_RequestNavigate(object sender, RequestNavigateEventArgs e)
        {
            RegPage RegistrationWindow = new RegPage();
            RegistrationWindow.Show();
            this.Close();
        }
    }
}